Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Biodegradable bursting release system










Image Number 4 for United States Patent #5429822.

A biodegradable polymeric multiphasic release system of one or more biodegradable bursting units capable of delivering biologically active substances in a burst or pulse at predetermined times and a method for constructing those units is disclosed. The individual bursting units of the system may take the form of a biodegradable, membrane coated capsule surrounding a core material which may include an active agent. The membrane ruptures after a predetermined time upon exposure to water or bodily, or other aqueous environmental fluids. The bursting units may be used in any situation in which a controlled pulsed release of an active substance is desired. The predetermined time release of each bursting unit is controlled by the composition of the core material, the initial radius and wall thickness of the membrane and the porosity of the membrane. The core material may also contain a chemical composition which generates gas as fluid is drawn into the bursting unit thus adding an additional design variable for predetermining bursts.








 
 
  Recently Added Patents
Avalanche photo diode and method of manufacturing the same
Microfluidic system incorporating a metal impregnated nanoporous material in a microfluidic pathway thereof
Data processing apparatus and data processing method for reducing an uneven color made up of two or more ink colors
Apparatus and methods for providing efficient space-time structures for preambles, pilots and data for multi-input, multi-output communications systems
Method and apparatus for increasing query traffic to a web site
Synthetic refrigeration oil composition for HFC applications
Biomedical electro-stimulator
  Randomly Featured Patents
Jack for lifting a vehicle
Pneumatically elevating recreational exercise device
Dried blood factor composition trehalose
Automobile signal lamp
Servo positioning system
Drive assembly for conveyor slats of reciprocating floor conveyor
Pastry
Preformed coronary artery guide catheter
Harvesting energy from flowing fluid
Adjustable tool for applying torque to a CPU fan unit